Plexciton Dirac points and topological modes

Joel Yuen-Zhou (), Semion K. Saikin, Tony Zhu, Mehmet C. Onbasli, Caroline A. Ross, Vladimir Bulovic and Marc A. Baldo
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Joel Yuen-Zhou: University of California–San Diego
Semion K. Saikin: Harvard University
Tony Zhu: Massachusetts Institute of Technology
Mehmet C. Onbasli: Massachusetts Institute of Technology
Caroline A. Ross: Massachusetts Institute of Technology
Vladimir Bulovic: Center for Excitonics, Research Laboratory of Electronics, Massachusetts Institute of Technology
Marc A. Baldo: Center for Excitonics, Research Laboratory of Electronics, Massachusetts Institute of Technology

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Plexcitons are polaritonic modes that result from the strong coupling between excitons and plasmons. Here, we consider plexcitons emerging from the interaction of excitons in an organic molecular layer with surface plasmons in a metallic film. We predict the emergence of Dirac cones in the two-dimensional band-structure of plexcitons due to the inherent alignment of the excitonic transitions in the organic layer. An external magnetic field opens a gap between the Dirac cones if the plexciton system is interfaced with a magneto-optical layer. The resulting energy gap becomes populated with topologically protected one-way modes, which travel at the interface of this plexcitonic system. Our theoretical proposal suggests that plexcitons are a convenient and simple platform for the exploration of exotic phases of matter and for the control of energy flow at the nanoscale.

Date: 2016
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DOI: 10.1038/ncomms11783

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